Terminal control/Cursor movement: Difference between revisions

=={{header|Go}}==

===External commands===

<lang go>package main

import (

"fmt"

"time"

"os"

"os/exec"

"strconv"

)

func main() {

tput("clear") // clear screen

tput("cup", "6", "3") // an initial position

time.Sleep(1 * time.Second)

tput("cub1") // left

time.Sleep(1 * time.Second)

tput("cuf1") // right

time.Sleep(1 * time.Second)

tput("cuu1") // up

time.Sleep(1 * time.Second)

// cud1 seems broken for me. cud 1 works fine though.

tput("cud", "1") // down

time.Sleep(1 * time.Second)

tput("cr") // begining of line

time.Sleep(1 * time.Second)

// get screen size here

var h, w int

cmd := exec.Command("stty", "size")

cmd.Stdin = os.Stdin

d, _ := cmd.Output()

fmt.Sscan(string(d), &h, &w)

// end of line

tput("hpa", strconv.Itoa(w-1))

time.Sleep(2 * time.Second)

// top left

tput("home")

time.Sleep(2 * time.Second)

// bottom right

tput("cup", strconv.Itoa(h-1), strconv.Itoa(w-1))

time.Sleep(3 * time.Second)

}

func tput(args ...string) error {

cmd := exec.Command("tput", args...)

cmd.Stdout = os.Stdout

return cmd.Run()

}</lang>

===ANSI escape codes===

Not meeting all task requirements. Some of the movements are awkward with ANSI escape codes alone and are best done with one of the other techniques shown.

<lang go>package main

import (

"fmt"

"time"

)

func main() {

fmt.Print("\033[2J\033[6;3H") // clear screen, move to an initial position

time.Sleep(1 * time.Second) // pause to let cursor blink

fmt.Print("\033[D") // left

time.Sleep(1 * time.Second)

fmt.Print("\033[C") // right

time.Sleep(1 * time.Second)

fmt.Print("\033[A") // up

time.Sleep(1 * time.Second)

fmt.Print("\033[B") // down

time.Sleep(1 * time.Second)

fmt.Print("\033[;H") // top left

time.Sleep(1 * time.Second)

}</lang>

===Ncurses===

{{libheader|curses}}

<lang go>package main

import (

"log"

"time"

gc "code.google.com/p/goncurses"

)

func main() {

s, err := gc.Init()

if err != nil {

log.Fatal("init:", err)

}

defer gc.End()

// an initial position

s.Move(6, 3)

s.Refresh() // update screen

time.Sleep(1 * time.Second) // allow time for cursor to blink

// left

y, x := s.CursorYX()

s.Move(y, x-1)

s.Refresh()

time.Sleep(1 * time.Second)

// right

y, x = s.CursorYX()

s.Move(y, x+1)

s.Refresh()

time.Sleep(1 * time.Second)

// up

y, x = s.CursorYX()

s.Move(y-1, x)

s.Refresh()

time.Sleep(1 * time.Second)

// down

y, x = s.CursorYX()

s.Move(y+1, x)

s.Refresh()

time.Sleep(1 * time.Second)

// beginning of line

y, x = s.CursorYX()

s.Move(y, 0)

s.Refresh()

time.Sleep(1 * time.Second)

// get window size for moves to edges

my, mx := s.MaxYX()

// end of line

y, x = s.CursorYX()

s.Move(y, mx-1)

s.Refresh()

time.Sleep(2 * time.Second)

// top left

s.Move(0, 0)

s.Refresh()

time.Sleep(2 * time.Second)

// bottom right

s.Move(my-1, mx-1)

s.Refresh()

s.GetChar()

}</lang>